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Note 7 - Leases and Deferred Rent - Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating cash flows from operating leases $ 176    
Operating leases    
Operating Lease, Right-of-Use Asset 2,818 $ 2,966
Current portion of operating lease liabilities, included in accrued liabilities 548    
Operating lease liabilities, net of current portion 2,406  
Total operating lease liabilities $ 2,954 $ 3,101  
Weighted average remaining lease term for operating leases (Year) 5 years 109 days    
Weighted average discount rate for operating leases 6.10%